Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ad6b42d3fa4e18…

MALICIOUS

PDF

45.6 KB Created: 2020-07-20 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a429fb3fc8cad09a1fa2a176f71855 SHA-1: 187c17e59bd3e5e6c98d42097fa8d2fefaa398fb SHA-256: b7ad6b42d3fa4e183c3719c923974ef56509a15b54dc5fadc3ac937af5383232
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=fractions%20worksheets%20ks3%20with%20answers'. The presence of a visual download button lure further supports the malicious intent. No scripts were extracted from this sample.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=fractions%20worksheets%20ks3%20with%20answers
    • http://files.makatontrainer.com/uploads/1/3/0/7/130775249/3639445.pdf
    • http://files.studyaston.com/uploads/1/3/1/6/131637853/f65772337f4ea6a.pdf
    • http://files.brolancon.com/uploads/1/3/0/9/130969238/9148747.pdf
    • http://files.southdakotamasters.org/uploads/1/3/0/8/130813362/9f35fd73e91958.pdf
    • http://files.elliemaysgrowingupridgeback.com/uploads/1/3/2/6/132683087/nizejiwefek_welojiva_doximamevuboxuk.pdf
    • http://files.immortalizedimage.com/uploads/1/3/1/4/131406222/lunefagazukij.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://files.lactationconsultantathome.com/uploads/1/3/0/7/130739101/lefubizadudoluw.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosaguli
    • https://lorapuz.files.wordpress.com/2020/06/89643917599.pdf
    • https://relotudop.files.wordpress.com/2020/07/segemuzuzufebaseli.pdf
    • https://tojutoleta344643586.files.wordpress.com/2020/07/nurasasebetulijepifatagud.pdf
    • https://xukejozu.files.wordpress.com/2020/07/daxedajukorosevafolezubo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/65728272604.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/43277490766.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujar.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/kazunotadizevene.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/tadujutabewiwojewanokat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/zamixiwuxagosom.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/26750360223.pdf
    • https://cdn.shopify.com/s/files/1/0434/7504/2457/files/jojudimuteveratawu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ec.bin
64a0225ce8764f9494f05ef105b44ba0bfd42ebaf0f3daad5b56a12631ce4af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 4920 bytes
font_01_sfnt_off000085a8.bin
81366e63b3f9e05749ae0e433c89e4c90c69ee789d857d10cef36ba04b9bd4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A8 10192 bytes

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